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The blast was reported in the same district where at least 61 were killed in a suicide attack on another Shia mosque in 2015

At least 11 people, including two policemen, were injured today during Eid-Al Azha prayers in Pakistan when a suicide bomber blew himself up outside a Shia mosque in southern Sindh province.

The blast was reported in Shikarpur district's Khanpur tehsil, around 470 kilometres north of Karachi, police said. A suicide attack on another Shia mosque in the same district killed at least 61 people last year in January.

Two suicide bombers tried to enter the Khanpur Imambargah but were intercepted by police, AFP reported quoting the officials. However, according to Pakistan daily Dawn, four suicide attackers had infiltrated Khanpur during Eid prayers.

"Four of our men are injured of whom one is critical," Umar Tufail, a senior local police officer told AFP.

Tufail added doctors were also trying to save the life of the other suspected bomber, who was injured when the first one blew himself up but failed to detonate himself.

"The attackers came as the worshippers were gathering to offer Eid prayers. Police were able to stop him at the gate outside the mosque," A.D. Khawaja, chief of police for Sindh province told AFP.

Worshippers overpowered the second would-be suicide bomber as the police were reeling from their injuries, he added.

Pakistan has been hit by frequent sectarian violence in recent years, most of it perpetrated by hardline Sunni Muslim groups against minority Shia Muslims.